Brush-holder.



htente i Aug. 2%, E309.

A. L. MOHUGH.

BRUSH HOLDER,

APPLICATION TILED JUNE 5, 1905. 932,309.

in van Fe'y. 3

Witnesses UNITED STATES ATENT FICE.

ANTHONY L. MeHUGH, OF NORWGOD, OHIO, ASSIGNOR TO THE BULLOCK ELECTRIC MANUFAC- TURING COEPANY, A CORPORATION OF OHIO.

BRUSH-HOLDER.

To all whom it may concern:

Be it known that I, ANTHONY L. Mo- HUGH, a citizen of the'United States, residing at Norwood, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Brush- Holders, of which the following is a full, clear, and exact specification.

My present invention relates to brushes and brush-holders for dynamo-electric machines.

In connection with the use of brushes and brush-holders such are. illustrated and described in Patent No. 634,804 granted to Cooper, et aZ., October 10, 1899, some diiiiculty has been experienced due to an irregular wearing away of the brush and a tendency for the brushes to twist around on the bearing surface or contact plate of the holder as the brush is fed toward the com mutator surface.

The main object of my invention is therefore to eliminate the evil effects due to the dilliculties stated above and to produce an eflicient and practicalbrush and holder.

A further object is to provide a simple and inexpensive means for attaching a flexi ble conductor or pig-tail to a carbon brush in order to overcome some of the difliculties which have been experienced heretofore.

In one of itsaspects the invention consists of a brush-holder body having a brush slidably mounted thereon, and held in place by means of a clamp embracing the brush and fastened thereto and having its projecting ends engaging guide grooves formed in said brush holder body In another of its aspects the invention com rises a carbon brush having a flexible con uctor or pig-tail fastened thereto in contact with the brush at a portion of the flexible conductor intermediate its ends.

The invention further comprises specific combinations of elements which will be here more. particularly inafter described and pointed out in the appended claims.

In the accompanying drawings, which illustrate the preferred embodiment of my nvention, Figure 1 is a sid elevation of my improved holder with the brush in position;

"Fig. 2 is a front elevation of same; Fig. 3 is Ia, plan View of same; Fig. 4 is. a section through the brush and holder on line 4tet of-F 1 nd Fig. 5 is a view of the form Specification etLetters Patent.

Application filed June 5, 1905.

Patented Aug. 24., 1909. Serial No. 263,824.

of flexible conductor or pig-tail I prefer to use.

Referring now to the drawings, the brushholder body is illustrated at (3. This holder is preferably a box-shaped casting and is provided with the opening 7 through which passes the stud upon which the holder is mounted. The set screws 8 are'employed for fastening the holder in position after it has been adjusted on said stud. Iivoted at 9 on the holder-body is the pressure-finger 10, the outer end of which bears against the upper-surface of the carbon brush 11, which is slidably mounted in said holder and engages the bearing surface or contact plate 12 of said holder-body. The pressure finger is held in contact with the brush by the spring 13, the lower end of which is fastened to the holder-body at 14, and the upper end of which is attached to the cross piece 15, the latter being adjustable in the notches 16 in order to adjust the pressure upon the finger 10 to obtain the pressure desired between the carbon brush 11 and commutator 17.

To prevent the brush from twisting about on the bearing surface 12, I provide a clamp which consists of the strip 18 of metal embracing three sides of the brush 11, and having its ends so shaped as to form overhanging flanges 19, which slide in the grooves 20 in the body 6 and co-act with the flanges 21, formed on two parallel edges of the surface 12. The strip 18 is fastened to brush 11 preferably 'by means of the bolt 22, which passes completely through the brush and is threaded into the opposite side of the strip 18 at .The strip 18 is also provided with the groove 23 which receives the flexible conductor or pig-tail 24 at a point intermediate the ends thereof, leaving said ends free to be fastened to thebrushholder. .A

considerable portion of the flexible conductor is held in intimate contact with the brush,

as indicated in Fig. 4; thus increasing the.

current carrying capacity of the contact and the pig-tail without necessitating a large number of soldered terminals and connece -tions, only two terminals 25 and 25= being employed in the form illustrated. These aterminals 25 and 25 are fastened to til holder-body at 26, (as shown in Figs. and 3).

All modifications and changes which may ing means having be made in the device herein illustrated and i described and. which do not involve a departure from the spirit of my invention, I

aim to cover in the appended claims.

,Having thus described my invention, what I claim as new and desire to secure by Letters Patent is I 1. In combination, J.- brush-holder body provided with guide, grooves, a brush, and

means for slidably mounting said brush onsaid holder-body, said means comprising a clamp emb wcmg the brush and fastened.

I e I thereto and having its pro ect1ng ends engaging said guide grooves.

In combination, a brush-holder body- 'provided with guide grooves, a brush, and

means for slidabl-y mounting said brush on said holder-body, said means comprising'a clamp consisting of a strip of metal embracing the brush and fastened thereto and having its projecting ends engaging said guide grooves, and apressure finger carried by said ho lder-body and bearing against the upper surface of said brush.

A brush-holder body rovided with a bearing surface on which a 'rush is adapted to slide and with flanges at the parallel edges of said surface, in combination with a brush engaging said surface and carrying clamping means which extends over the front face ofthe brush, said clamping means having overhanging flanges which co-act with the flanges on said holder-body 'to constrain said brush to move rectilinearly on said surface. v

4. A brush-holder body rovided with a bearing surface on which a rush is adapted to slide and with flanges at the parallel edges of saidsurface, in combination with a brush engagim said surface and carrying clampco-act with the anges on said 110 der-body to constrain said brush to move rectilinearly on said surface, an adjustable pressure finger carried by said holder body and bearing against the upper surface of said brush, and anfiexible conductor held by said clamping means. i

5. In combination, a brush-holder body.

overhanging flan eswhich provided with uide grooves, a brush, and

means for' slide ly mounting said brush on said holder-body, said means coin rising a clam consisting of a strip of meta embracing t e brush and fastened thereto and having its projecting ends'eng aging said guide grooves, and a flexible electrical conductor or pig-tail fastened to brush by being clamped between said strip and the'brush.

6. In combination, a brush-holder body providedwith guide grooves, a brush, and means for-slidablv mounting said brush on said holder body, said means comprising a clamp consisting ofa strip of metal embrac= ing the brush and fastened thereto and havgrooves, a flexible electrical conductor or plg-tall fastened to said brush by having a part of said conductor intermediate its ends and means for fastening the free ends .of said conductor to the holder-body.

7. A brush-holder body provided with a bearing surface on which a hrushgis adapted to slide and with flanges at the parallel edges ,of said surface, 111 combination with a ing three sides of said brush and provided with overhanging flanges engaging the flanges on said holder-body,.and a-bolt pass ing completely through said brush to fasten the stripto said brush. i

8. In combination, a brush holder body provided with guide grooves, a brush, means 7 for slidably mounting said brush upon said brush holder body, sald means comprising a ing its ends engaging said guide groove, a flexible conductor or pig-tall, and means inpig-tail intermediate its ends the ends thereof, the fastenin means con sisting of a strip of metal whic receives the conductor and is secured tothe brush.

brush having a flexible conductor or ig-tail fastened thereto in contact with saida brush at a portion of said conductor intermediate the ends thereof, ,the fastening means confor attaching said striptothe brush.

12. As an article of manufacture, a carbon biush, and a metal guide, a bolt securing the latter to the brush, said uide embracing threesides of the brush and havin portions projecting from, said brush inpara e1 planes and having its,extreme ends bent toward each other in a plane'parallel to the fourth tance therefrom.- 7

-.13. As an article of manufacture, a carbon brush, a metal guide strip, a bolt securing the latter to the brush, said strip embracing three sides of the brush and having portions ing its projecting ends engaging said (guide projecting from said brush in parallel planes I clamped bet-ween's'aid strip and the brusln.

brush engaging said surface, a clamp carried -by said brush consisting of a strip embracmetal strip embracing said brush, and hav cludingsaid metal strip 'for securing said brush 11. As an article of manufacture, a carbon sisting of a strip of metal provided with agroove'to receive said conductor and abolt side of the brush at a-predetermined dis- 

